Single-Cell Transcriptome Barcoding via Ligation-Free Primer Extension
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for single cell transcriptome analysis, such as Quantum Barcoding (QBC), require ligation steps that are inefficient for detecting rare nucleic acid targets and involve additional reagents, making them less suitable for whole transcriptome analysis.
Innovation Solution
A method using a reverse transcriptase enzyme with terminal transferase activity to assemble compound barcodes on nucleic acid targets via a split-pool process, eliminating the need for ligation and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ligation is used to assemble barcodes on nucleic acid targets, then barcodes can be attached to targets, but the process is inefficient and requires additional reagents
Solution Approach 1:
The patent changes the chemical reaction mechanism from ligation to primer extension. This parameter change allows barcode subunits to be assembled on nucleic acid targets using a more efficient polymerase-based reaction that requires fewer reagents and conditions, directly resolving the contradiction between productivity and device complexity
Solution Approach 2:
The patent replaces the mechanical/enzymatic ligation process with a biochemical primer extension process. This substitution uses the terminal transferase activity of reverse transcriptase to add barcode subunits, which is a more efficient and simpler process than traditional ligation, thereby improving productivity while reducing reagent complexity
2Reliability
If ligation is used for barcode assembly, then barcodes can be formed, but the process is less suitable for detecting rare nucleic acid targets
Solution Approach 1:
The patent changes the reaction type from ligation to primer extension, which has higher efficiency and better suitability for detecting rare nucleic acid targets. This parameter change improves both reliability for rare target detection and productivity, as primer extension is a more robust and efficient process
Solution Approach 2:
The patent uses primer extension to copy barcode subunits onto the nucleic acid targets. This copying mechanism is more efficient and reliable than ligation, especially for rare targets, because it leverages the high fidelity and efficiency of polymerase-based replication
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables robust and efficient detection of multiple nucleic acid targets in individual cells without the need for cell isolation, improving the efficiency of whole transcriptome analysis.
Implementation Method 1
contacting the plurality of cells in a sample with an oligonucleotide primer for each target nucleic acid in the presence of a nucleic acid polymerase having a terminal transferase activity and extending the oligonucleotide primer to form a copy strand having one or more non-templated nucleotides at the 3′-end of the copy strand
Implementation Method 2
distributing the sample into a first set of reaction volumes, each volume containing a first barcode subunit and a nucleic acid polymerase to extend the 3′-end of the copy strand to copy the first barcode subunit
Data Source
AI summary
The invention is a method of single cell transcriptome analysis. The method comprises detecting multiple transcripts in each individual cell of the plurality of cells by barcoding the transcripts with a cell-specific compound barcode formed using a DNA polymerase and a terminal transferase, optionally in a single enzyme such as a reverse transcriptase.